摘要
本文根据有限元法对南海及邻区现代构造应力场进行了反演计算,计算中将本区岩石圈看成是一不均匀的弹性板,根据各地区杨氏模量、泊松比以及岩石圈厚度的不同,组成5种材料区,并离散成646个三角形单元和359个节点。选择了有代表性的4种模式,它们分别反映了印-澳板块和菲律宾海板块对本区的影响。计算结果表明:本区最大主压应力方向与震源机制解的P轴方向基本一致;最大剪应力(τ_(max))大的地区则是强震频繁活动的地区。
The inversed calculation of the modern tectonic stress field of South China Sea and its vicinity has been made by means of the finite element method. The lithosphere of this region is taken as an elastic plate which is composed of 5 parts with different Young's modulus, Poisson's ratio and thickness. The whole region is divided into 646 triangular elements with 359 points. Four models of boundary forces,which represent the forces exerted to South China Sea and its vicinity by the Indian Ocean Australia Plate and Philippine Sea Plate respectively, have been tested.The calculative result shows that the directions of maximum compressive principal stress are accordant with focal mechanism solutions. The region of high values of maximum shear stress is the one of frequent macroseismic activities.
出处
《热带海洋》
CSCD
1991年第4期15-21,共7页
基金
中国科学院南海海洋研究所所长基金资助项目(890401)阶段性成果
关键词
构造应力场
反演
地震
南海
modern tectonic stress field, inversion, macroseismic activities, South China Sea and its vicinity
